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Weather & Climate in Ammon, ID
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Ammon has a cool climate with an average annual temperature of 42°F (6°C). Winters average 22°F in January while summers reach 65°F in July. The area gets 302 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 17.3 inches (drier than the 38-inch national average). The area receives 65.7 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 33. The city sits at an elevation of 4,717 feet.
Temperature
22°F Jan (-5°C)
65°F Jul (18°C)
| Annual Average | 42.1°F |
| 22% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 65°F (18°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 4,717 ft (1,438 m) |
| Area | 7.3 sq mi (18.8 km²) |
| Population Density | 2,264/sq mi |
| Coordinates | 43.4717°N, 111.9603°W |
| Timezone | America/Boise |
| County | Bonneville County County |
| Nearest Airport | Idaho Falls Regional (IDA) 6 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 33.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 82.4 / 100 |
| Social Vulnerability | 12.2 / 100 |
| Community Resilience | 92.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Moderate |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Moderate |
| Volcano | Very Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1,508 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.8.
| Feb 3, 1994 | 4 km SSE of Auburn, Wyoming | M5.8 | 112 km | 8 km |
| Apr 21, 2001 | 29 km WSW of Freedom, Idaho | M5.3 | 76 km | 1 km |
| Sep 2, 2017 | 12 km E of Soda Springs, Idaho | M5.3 | 101 km | 10 km |
| Sep 10, 2017 | 9 km NNW of Georgetown, Idaho | M5.0 | 110 km | 10 km |
| Jan 7, 2004 | 20 km ESE of Kelly, Wyoming | M5.0 | 128 km | 3 km |
| Feb 11, 1994 | 3 km SSE of Auburn, Wyoming | M4.8 | 111 km | 5 km |
| Aug 27, 2016 | 4 km ENE of Bondurant, Wyoming | M4.8 | 132 km | 12 km |
| Aug 5, 2010 | 19 km E of Kelly, Wyoming | M4.8 | 127 km | 5 km |
| Sep 11, 2017 | 9 km NW of Georgetown, Idaho | M4.7 | 111 km | 8 km |
| Dec 28, 1993 | 38 km NE of Bondurant, Wyoming | M4.7 | 148 km | 8 km |
| Sep 3, 2017 | 10 km E of Soda Springs, Idaho | M4.7 | 101 km | 8 km |
| Feb 4, 1994 | 4 km WNW of Fairview, Wyoming | M4.7 | 114 km | 5 km |
| Sep 3, 2017 | 15 km ESE of Soda Springs, Idaho | M4.7 | 105 km | 10 km |
| Sep 10, 2017 | 12 km ESE of Soda Springs, Idaho | M4.7 | 104 km | 5 km |
| Sep 6, 2017 | 11 km NNW of Georgetown, Idaho | M4.6 | 109 km | 10 km |
| Apr 9, 2019 | 9 km NE of Lima, Montana | M4.6 | 143 km | 14 km |
| Sep 4, 2017 | 13 km ESE of Soda Springs, Idaho | M4.5 | 103 km | 6 km |
| Feb 7, 1994 | 4 km SW of Fairview, Wyoming | M4.5 | 119 km | 5 km |
| Apr 5, 2011 | 28 km NNE of Spencer, Idaho | M4.4 | 127 km | 12 km |
| Jan 26, 2018 | 5 km NNW of Georgetown, Idaho | M4.4 | 114 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
79 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 3 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 7, 1978 | EF2 | 6 km | 1.5 mi | 0 |
| Sep 26, 1959 | EF2 | 48 km | 1.0 mi | 0 |
| May 31, 2018 | EF1 | 65 km | 12.0 mi | 0 |
| Jun 1, 2002 | EF1 | 30 km | 2.5 mi | 0 |
| Feb 14, 2000 | EF1 | 19 km | 12.0 mi | 0 |
| Feb 14, 2000 | EF1 | 62 km | 14.0 mi | 0 |
| Feb 14, 2000 | EF1 | 28 km | 9.0 mi | 0 |
| Jul 20, 1999 | EF1 | 85 km | 2.5 mi | 0 |
| May 31, 1997 | EF1 | 59 km | 4.0 mi | 0 |
| Jun 2, 1992 | EF1 | 24 km | 0.5 mi | 0 |
| Jun 4, 1991 | EF1 | 23 km | 0.2 mi | 0 |
| Mar 25, 1991 | EF1 | 81 km | 1.0 mi | 0 |
| Apr 17, 1988 | EF1 | 23 km | 0.5 mi | 0 |
| Apr 17, 1988 | EF1 | 24 km | 2.0 mi | 0 |
| Mar 23, 1988 | EF1 | 32 km | 15.0 mi | 0 |
| Apr 11, 1985 | EF1 | 50 km | 0.1 mi | 0 |
| May 15, 1984 | EF1 | 43 km | 8.0 mi | 0 |
| Aug 18, 1983 | EF1 | 92 km | 2.5 mi | 0 |
| Apr 21, 1981 | EF1 | 22 km | 1.1 mi | 0 |
| Jul 8, 1980 | EF1 | 24 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Hell's Half Acre (40 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Hell's Half Acre | Shield | 1,631 m (5,351 ft) | -3250 | 40 km |
| Wapi Lava Field | Shield | 1,604 m (5,262 ft) | -300 | 122 km |
| Craters of the Moon | Pyroclastic cone(s) | 2,005 m (6,578 ft) | -130 | 124 km |
| Yellowstone | Caldera(s) | 2,805 m (9,203 ft) | -1350 | 148 km |
| Black Butte Crater Lava Field | Shield | 1,478 m (4,849 ft) | -8400 | 196 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: COXS WELL (219,424 acres, 1996).
| Year | Name | Acres Burned | Distance |
| 1996 | COXS WELL | 219,424 | 97 km |
| 2010 | JEFFERSON | 108,542 | 54 km |
| 2019 | SHEEP | 107,233 | 64 km |
| 2018 | GRASSY RIDGE | 106,164 | 74 km |
| 2000 | COFFEE POINT | 73,480 | 77 km |
| 2016 | HENRYS CREEK | 52,988 | 16 km |
| 1999 | CEDAR BUTTE | 49,625 | 68 km |
| 2011 | T17 | 45,631 | 67 km |
| 1999 | INEEL FIRE | 43,547 | 58 km |
| 2000 | COFFEE POINT NORTH | 35,980 | 90 km |
| 1992 | SAGEHEN | 26,663 | 44 km |
| 2017 | WILDHORSE | 25,861 | 94 km |
| 1998 | TILDEN 2 | 23,183 | 48 km |
| 1999 | GRANDVIEW | 23,031 | 96 km |
| 2017 | LAVA FLOW | 22,217 | 74 km |
| 2012 | CEDAR BUTTE WSA | 20,564 | 69 km |
| 1994 | BUTTE CITY | 18,170 | 89 km |
| 2012 | RIDGE TOP | 17,793 | 37 km |
| 2017 | DEER PARK | 17,745 | 44 km |
| 2000 | FISHER SPRINGS | 17,428 | 99 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 1.3 in | |
| February | 25°F (-4°C) | 1.1 in | |
| March | 32°F (0°C) | 1.1 in | |
| April | 41°F (5°C) | 1.2 in | |
| May | 50°F (10°C) | 1.7 in | Wettest |
| June | 59°F (15°C) | 1.5 in | |
| July | 65°F (18°C) | 0.9 in | Driest |
| August | 66°F (19°C) | 0.9 in | Warmest |
| September | 56°F (13°C) | 1.1 in | |
| October | 45°F (7°C) | 1.1 in | |
| November | 31°F (-0°C) | 1.4 in | |
| December | 21°F (-6°C) | 1.3 in | Coldest |
Ammon has a seasonal temperature swing of 44°F / from 21°F in December to 66°F in August. Total annual precipitation is 14.6 inches, with May being the wettest month (1.7") and July the driest (0.9").